CPU Texture GetDimensions support (shader-slang#1283)

* Added CPU support for GetDimensions on C++/CPU target.
Added texture-get-dimension.slang test

* Fix some typos.

* Update CUDA docs.

* Fix output of GetDimensions on glsl when has an array.
Disabled VK - because VK renderer doesn't support createTextureView

* Fix typo.

* Fix typo.

* Fix bad-operator-call diagnostics output.

Author: jsmall-zzz

docs/cuda-target.md

@@ -219,6 +219,8 @@ Some features are not available because they cannot be mapped with appropriate b
 * Not all Wave intrinsics are supported
 * There is not complete support for all methods on 'objects' like textures etc. 
 * Does not currently support combined 'TextureSampler'. A Texture behaves equivalently to a TextureSampler and Samplers are ignored.
+* Half type is not currently supported
+* GetDimensions is not available on any Texture type currently - as there doesn't appear to be a CUDA equivalent 
 
 Language aspects
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